You'll have to decide what the "primary" goal is, but there was certainly the sense in the past that a U.S. high school graduate would be suitable for most jobs, either blue collar (shop class used to be quite popular), white collar (academic classes, particularly English), or indeed housewife (home economy). No matter what, though, a mastery of the 3 Rs (reading, writing, and arithmetic) was considered essential to all of these (you have to know arithmetic to balance your checkbook, do taxes, measure for construction, etc.). High school wasn't necessarily a specialized occupational school, but there was an expectation you would be learning useful skills for your future.
That's what I'm getting at -- life skills are much more broad than occupational skills. Art, PE, health, sports, civics, etc. are taught in schools because they produce people with more well-rounded life skills, not because it produces better bankers or factory workers.
